Verified Solution • 2025–26 Session moderate

QJEEM21Chc236: JEE Main 2021 Chemistry - Class 12 JEEM21Chc236 Solution: Select the graph that correctly describes the adsorption…

Select the graph that correctly describes the adsorption isotherms at two temperatures T1, and T2 (T1 > T2) for a gas :

(x - mass of the gas absorbed ; m - mass of adsorbent ; P - pressure)

Multiple Choice Options

  • A https://ik.imagekit.io/novatra/photos/8d7a33e95988c1987a1a6ac0fdce44e06ebb5c7156393843861f940a880b2880.webp
  • B https://ik.imagekit.io/novatra/photos/861d9ffd525652fae1cade3372bbb416886639a2d421629588c82fe9232efad8.webp
  • C https://ik.imagekit.io/novatra/photos/b9c080e8175d79059faf89cfcc21e33e1ad94d4949e5bae1b3c8b5dbe01058ec.webp
  • D https://ik.imagekit.io/novatra/photos/24044ab165a0996cc02daf3106ea44bf418dc038adae30ae32b24847dca4ed78.webp

Step-by-Step Verified Solution

According to Freundlich adsorption isotherm, in the median range of pressure

        xm∝P1n{x \over m} \propto {P^{{1 \over n}}}

⇒\Rightarrow    xm{x \over m} = kP 1n^{{1 \over n}}

On increasing temperature xm{x \over m} decreases.

∵\because Adsorption is generally exothermic in nature. Hence, correct option is (A).

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